Closures and loop scope

[w0rp]

Huh, this is disappointing. I haven't used closures enough in D 
to notice this issue, but I know of this kind of issue very well, 
because it is a common annoyance in JavaScript. Newer, 
non-cross-browsers versions of JavaScript get around this with 
'let' instead of 'var,' which introduces block scope. So 
something like this works as expected:

let arr = Array(5);

for (let i = 0; i < 5; ++i) {
     arr[i] = function() { return i; }; // The scoped i is used 
here.
}

let anotherArr = Array(5);

for (let i = 0; i < 5; ++i) {
     anotherArr[i] = arr[i](); // Return a different i each time.
}

console.log(anotherArr); // 0, 1, 2, 3, 4, as expected

Is it possible for similar semantics to exist in D by default? I 
imagine this is harder to implement.